Includes: digital images of books, periodicals, rare books and old materials (manuscripts, prints, and maps created before 1868), and official gazettes held by the NDL, historical sound recordings, and some born-digital materials (e.g. internet resources).

Archived Japanese official institutions’ websites, including: the government, the Diet, the courts, local governments, independent administrative organizations, and universities. Websites of cultural and international events held in Japan, and those related to electronic magazines, are also archived based on the permission of their webmasters.